256412305 has 4 divisors (see below), whose sum is σ = 307694772. Its totient is φ = 205129840.

The previous prime is 256412297. The next prime is 256412323. The reversal of 256412305 is 503214652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148937616 + 107474689 = 12204^2 + 10367^2 .

It is not a de Polignac number, because 256412305 - 2³ = 256412297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25641226 + ... + 25641235.

It is an arithmetic number, because the mean of its divisors is an integer number (76923693).

Almost surely, 2^256412305 is an apocalyptic number.

It is an amenable number.

256412305 is a deficient number, since it is larger than the sum of its proper divisors (51282467).

256412305 is an equidigital number, since it uses as much as digits as its factorization.

256412305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51282466.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 256412305 is about 16012.8793475752. The cubic root of 256412305 is about 635.3011199208.

Adding to 256412305 its reverse (503214652), we get a palindrome (759626957).

The spelling of 256412305 in words is "two hundred fifty-six million, four hundred twelve thousand, three hundred five".